mirror of
https://github.com/direct-img/direct-img.link.git
synced 2026-03-16 18:51:01 +00:00
249 lines
9.3 KiB
JavaScript
249 lines
9.3 KiB
JavaScript
import { braveImageSearch } from "./_utils/brave.js";
|
|
import { bingImageSearchFallback } from "./_utils/bing.js";
|
|
|
|
export async function onRequest(context) {
|
|
const { request, env, params } = context;
|
|
const url = new URL(request.url);
|
|
const path = params.path?.join("/") || "";
|
|
|
|
if (!path || path === "index.html" || path === "favicon.ico" || path === "robots.txt" || path === "limit.webp" || path === "bad.webp") {
|
|
return env.ASSETS.fetch(request);
|
|
}
|
|
|
|
const rawQueryPart = url.pathname.slice(1).replace(/\/+$/, "");
|
|
if (rawQueryPart.includes(".") || rawQueryPart.includes("/")) {
|
|
return env.ASSETS.fetch(new Request(new URL("/bad.webp", url.origin)));
|
|
}
|
|
|
|
const query = normalizeQuery(path);
|
|
if (!query) return jsonResponse(400, { error: "Empty query" });
|
|
if (query.length > 200) return jsonResponse(400, { error: "Query too long (max 200 characters)" });
|
|
|
|
const cacheKey = query;
|
|
const r2Key = await sha256(query);
|
|
|
|
const cached = await env.DIRECT_IMG_CACHE.get(cacheKey, "json");
|
|
if (cached) {
|
|
if (cached.err) return env.ASSETS.fetch(new Request(new URL("/bad.webp", url.origin)));
|
|
const obj = await env.R2_IMAGES.get(r2Key);
|
|
if (obj) {
|
|
const nowSec = Math.floor(Date.now() / 1000);
|
|
const remainingSec = Math.max(0, (cached.t + 5184000) - nowSec);
|
|
return new Response(obj.body, { headers: imageHeaders(cached.ct, remainingSec * 1000) });
|
|
}
|
|
}
|
|
|
|
const ip = request.headers.get("cf-connecting-ip") || "unknown";
|
|
const today = new Date().toISOString().slice(0, 10);
|
|
const rateId = await sha256(`${ip}:${today}`);
|
|
let count = 1;
|
|
|
|
if (env.SURREAL_URL && env.SURREAL_USER && env.SURREAL_PASS) {
|
|
const auth = btoa(`${env.SURREAL_USER}:${env.SURREAL_PASS}`);
|
|
const surrealHeaders = {
|
|
"Accept": "application/json",
|
|
"Authorization": `Basic ${auth}`,
|
|
"surreal-ns": "direct_img",
|
|
"surreal-db": "rate_limit",
|
|
};
|
|
|
|
try {
|
|
const initSql = `DEFINE NAMESPACE IF NOT EXISTS direct_img; USE NS direct_img; DEFINE DATABASE IF NOT EXISTS rate_limit;`;
|
|
await fetch(`${env.SURREAL_URL}/sql`, {
|
|
method: "POST",
|
|
headers: { ...surrealHeaders, "surreal-ns": "direct_img", "surreal-db": "rate_limit" },
|
|
body: initSql
|
|
});
|
|
} catch (err) {
|
|
context.waitUntil(notify(env, {
|
|
title: "SurrealDB Init Error",
|
|
message: `Failed to init NS/DB: ${err.message}`,
|
|
tags: "warning",
|
|
priority: 4
|
|
}));
|
|
}
|
|
|
|
const sql = `UPSERT rate:\`${rateId}\` SET count = IF count IS NONE THEN 1 ELSE count + 1 END, updated_at = time::now() RETURN count;`;
|
|
|
|
try {
|
|
const dbRes = await fetch(`${env.SURREAL_URL}/sql`, {
|
|
method: "POST",
|
|
headers: surrealHeaders,
|
|
body: sql
|
|
});
|
|
|
|
const rawText = await dbRes.text();
|
|
|
|
if (!dbRes.ok) {
|
|
context.waitUntil(notify(env, {
|
|
title: "SurrealDB HTTP Error",
|
|
message: `Status: ${dbRes.status}\nBody: ${rawText.slice(0, 500)}`,
|
|
tags: "warning,x",
|
|
priority: 4
|
|
}));
|
|
} else {
|
|
try {
|
|
const data = JSON.parse(rawText);
|
|
if (data[0]?.status === "OK" && data[0]?.result?.length > 0) {
|
|
count = data[0].result[0].count;
|
|
} else {
|
|
context.waitUntil(notify(env, {
|
|
title: "SurrealDB Unexpected Result",
|
|
message: `Response: ${rawText.slice(0, 500)}`,
|
|
tags: "warning",
|
|
priority: 3
|
|
}));
|
|
}
|
|
} catch (parseErr) {
|
|
context.waitUntil(notify(env, {
|
|
title: "SurrealDB Parse Error",
|
|
message: `Parse error: ${parseErr.message}\nRaw: ${rawText.slice(0, 500)}`,
|
|
tags: "warning",
|
|
priority: 4
|
|
}));
|
|
}
|
|
}
|
|
|
|
if (Math.random() < 0.05) {
|
|
context.waitUntil(
|
|
fetch(`${env.SURREAL_URL}/sql`, {
|
|
method: "POST",
|
|
headers: surrealHeaders,
|
|
body: `DELETE rate WHERE updated_at < time::now() - 25h;`
|
|
}).catch(() => {})
|
|
);
|
|
}
|
|
} catch (err) {
|
|
context.waitUntil(notify(env, {
|
|
title: "SurrealDB Fetch Failed",
|
|
message: `Error: ${err.message}\nURL: ${env.SURREAL_URL}`,
|
|
tags: "boom,x",
|
|
priority: 4
|
|
}));
|
|
}
|
|
} else {
|
|
context.waitUntil(notify(env, {
|
|
title: "SurrealDB Not Configured",
|
|
message: `Missing: ${!env.SURREAL_URL ? 'SURREAL_URL ' : ''}${!env.SURREAL_USER ? 'SURREAL_USER ' : ''}${!env.SURREAL_PASS ? 'SURREAL_PASS' : ''}`,
|
|
tags: "warning",
|
|
priority: 4
|
|
}));
|
|
}
|
|
|
|
if (count > 35) {
|
|
context.waitUntil(notify(env, { title: "Rate Limit Hit", message: `IP ${ip} hit limit for: ${query}`, tags: "warning,no_entry", priority: 2 }));
|
|
return env.ASSETS.fetch(new Request(new URL("/limit.webp", url.origin)));
|
|
}
|
|
|
|
context.waitUntil(notify(env, { title: "New Search", message: `Query: ${query} (Search #${count} for ${ip})\n${url.origin}/${path}`, tags: "mag", priority: 3 }));
|
|
|
|
const fail = async (t, m, tag, p) => {
|
|
context.waitUntil(notify(env, { title: t, message: m, tags: tag, priority: p }));
|
|
await env.DIRECT_IMG_CACHE.put(cacheKey, JSON.stringify({ t: Math.floor(Date.now() / 1000), err: true }), { expirationTtl: 86400 });
|
|
return env.ASSETS.fetch(new Request(new URL("/bad.webp", url.origin)));
|
|
};
|
|
|
|
let imageUrls = await braveImageSearch(query, env.BRAVE_API_KEY);
|
|
|
|
if (!imageUrls || imageUrls.length === 0) {
|
|
context.waitUntil(notify(env, { title: "Brave Search Empty", message: `No results for: ${query}. Trying Bing Fallback.`, tags: "warning,mag", priority: 3 }));
|
|
imageUrls = await bingImageSearchFallback(query);
|
|
}
|
|
|
|
if (!imageUrls || imageUrls.length === 0) return await fail("Search Failed", `Both Brave and Bing returned no results for: ${query}`, "question", 3);
|
|
|
|
const GLOBAL_DEADLINE = Date.now() + 20000;
|
|
let imgResult = null;
|
|
const failReasons = [];
|
|
|
|
for (const imgUrl of imageUrls) {
|
|
const remaining = GLOBAL_DEADLINE - Date.now();
|
|
if (remaining <= 500) {
|
|
failReasons.push("Global timeout reached");
|
|
break;
|
|
}
|
|
const res = await fetchImage(imgUrl, Math.min(remaining, 5000));
|
|
if (res.success) {
|
|
imgResult = res;
|
|
break;
|
|
} else {
|
|
try {
|
|
const host = new URL(imgUrl).hostname.replace(/^www\./, '');
|
|
failReasons.push(`${host}=${res.reason}`);
|
|
} catch {
|
|
failReasons.push(`invalid_url=${res.reason}`);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!imgResult) {
|
|
const reasonStr = failReasons.slice(0, 6).join(", ") + (failReasons.length > 6 ? ", ..." : "");
|
|
return await fail("Fetch Error (502)", `All sources failed for: ${query}\nReasons: ${reasonStr}`, "boom,x", 4);
|
|
}
|
|
|
|
const { buffer: imgBuffer, contentType: finalContentType } = imgResult;
|
|
await env.R2_IMAGES.put(r2Key, imgBuffer, { httpMetadata: { contentType: finalContentType } });
|
|
|
|
const TTL_SECONDS = 5184000;
|
|
await env.DIRECT_IMG_CACHE.put(cacheKey, JSON.stringify({ t: Math.floor(Date.now() / 1000), ct: finalContentType }), { expirationTtl: TTL_SECONDS });
|
|
|
|
return new Response(imgBuffer, { headers: imageHeaders(finalContentType, TTL_SECONDS * 1000) });
|
|
}
|
|
|
|
async function notify(env, { title, message, tags, priority }) {
|
|
if (!env.NTFY_URL) return;
|
|
const endpoint = env.NTFY_URL.startsWith("http") ? env.NTFY_URL : `https://${env.NTFY_URL}`;
|
|
try {
|
|
await fetch(endpoint, { method: "POST", body: message, headers: { "Title": title, "Tags": tags, "Priority": priority.toString() } });
|
|
} catch {}
|
|
}
|
|
|
|
function normalizeQuery(path) {
|
|
try {
|
|
return decodeURIComponent(path.replace(/\+/g, " ")).toLowerCase().trim().replace(/[\x00-\x1f]/g, "").replace(/\/+$/, "").replace(/\s+/g, " ");
|
|
} catch {
|
|
return path.toLowerCase().trim().replace(/[\x00-\x1f]/g, "").replace(/\/+$/, "").replace(/\s+/g, " ");
|
|
}
|
|
}
|
|
|
|
async function sha256(str) {
|
|
const buf = await crypto.subtle.digest("SHA-256", new TextEncoder().encode(str));
|
|
return [...new Uint8Array(buf)].map(b => b.toString(16).padStart(2, "0")).join("");
|
|
}
|
|
|
|
async function fetchImage(imageUrl, timeoutMs = 5000) {
|
|
try {
|
|
const res = await fetch(imageUrl, {
|
|
headers: { "User-Agent": "Mozilla/5.0", "Accept": "image/avif,image/webp,image/*,*/*;q=0.8" },
|
|
redirect: "follow", signal: AbortSignal.timeout(timeoutMs), cf: { cacheTtl: 0 }
|
|
});
|
|
if (!res.ok) return { success: false, reason: `HTTP ${res.status}` };
|
|
|
|
const ct = res.headers.get("content-type") || "";
|
|
if (!ct.startsWith("image/")) return { success: false, reason: `Bad CT: ${ct.split(';')[0]}` };
|
|
|
|
const size = res.headers.get("content-length");
|
|
if (size && parseInt(size) > 10485760) return { success: false, reason: `Header >10MB` };
|
|
|
|
const buffer = await res.arrayBuffer();
|
|
if (buffer.byteLength > 10485760) return { success: false, reason: `Buffer >10MB` };
|
|
|
|
return { success: true, buffer, contentType: ct };
|
|
} catch (err) {
|
|
return { success: false, reason: err.name === 'TimeoutError' ? 'Timeout' : err.message };
|
|
}
|
|
}
|
|
|
|
function imageHeaders(contentType, maxAgeMs) {
|
|
return {
|
|
"Content-Type": contentType,
|
|
"Cache-Control": `public, max-age=${Math.max(0, Math.floor(maxAgeMs / 1000))}`,
|
|
"Access-Control-Allow-Origin": "*",
|
|
"X-Content-Type-Options": "nosniff",
|
|
};
|
|
}
|
|
|
|
function jsonResponse(status, body) {
|
|
return new Response(JSON.stringify(body), { status, headers: { "Content-Type": "application/json", "Access-Control-Allow-Origin": "*" } });
|
|
}
|